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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2016-07-11 20:32:12 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2016-07-11 20:32:12 +0530
commitc10f90dcef42092a96007fed7e77f9d470e5bb76 (patch)
treed4e260bbfec4a61d50a17f3be8fc64a0b7b01b4b /nptl
parent26c2910ac6889dd21f128d9071418492d544a2dc (diff)
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Revert "Add pretty printers for the NPTL lock types"
This reverts commit 62ce266b0b261def2c6329be9814ffdcc11964d6. The change is not mature enough because it needs the following fixes: 1. Redirect test output to a file like other tests 2. Eliminate the need to use a .gdbinit because distributions will break without it. I should have caught that but I was in too much of a hurry to get the patch in :/ 3. Feature checking during configure to determine things like minimum required gdb version, python-pexpect version, etc. to make sure that tests work correctly.
Diffstat (limited to 'nptl')
-rw-r--r--nptl/Makefile1
-rw-r--r--nptl/nptl-printers.py593
-rw-r--r--nptl/nptl_lock_constants.pysym75
3 files changed, 0 insertions, 669 deletions
diff --git a/nptl/Makefile b/nptl/Makefile
index 09e09dd..0d8aade 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -307,7 +307,6 @@ gen-as-const-headers = pthread-errnos.sym \
unwindbuf.sym \
lowlevelrobustlock.sym pthread-pi-defines.sym
-gen-py-const-headers = nptl_lock_constants.pysym
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
diff --git a/nptl/nptl-printers.py b/nptl/nptl-printers.py
deleted file mode 100644
index f64216f..0000000
--- a/nptl/nptl-printers.py
+++ /dev/null
@@ -1,593 +0,0 @@
-# Pretty printers for the NPTL lock types.
-#
-# Copyright (C) 2016 Free Software Foundation, Inc.
-# This file is part of the GNU C Library.
-#
-# The GNU C Library is free software; you can redistribute it and/or
-# modify it under the terms of the GNU Lesser General Public
-# License as published by the Free Software Foundation; either
-# version 2.1 of the License, or (at your option) any later version.
-#
-# The GNU C Library is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with the GNU C Library; if not, see
-# <http://www.gnu.org/licenses/>.
-
-"""This file contains the gdb pretty printers for the following types:
-
- * pthread_mutex_t
- * pthread_mutexattr_t
- * pthread_cond_t
- * pthread_condattr_t
- * pthread_rwlock_t
- * pthread_rwlockattr_t
-
-You can check which printers are registered and enabled by issuing the
-'info pretty-printer' gdb command. Printers should trigger automatically when
-trying to print a variable of one of the types mentioned above.
-"""
-
-from __future__ import print_function
-
-import gdb
-from nptl_lock_constants import *
-
-MUTEX_TYPES = {
- PTHREAD_MUTEX_NORMAL: ('Type', 'Normal'),
- PTHREAD_MUTEX_RECURSIVE: ('Type', 'Recursive'),
- PTHREAD_MUTEX_ERRORCHECK: ('Type', 'Error check'),
- PTHREAD_MUTEX_ADAPTIVE_NP: ('Type', 'Adaptive')
-}
-
-class MutexPrinter(object):
- """Pretty printer for pthread_mutex_t."""
-
- def __init__(self, mutex):
- """Initialize the printer's internal data structures.
-
- Args:
- mutex: A gdb.value representing a pthread_mutex_t.
- """
-
- data = mutex['__data']
- self.lock = data['__lock']
- self.count = data['__count']
- self.owner = data['__owner']
- self.kind = data['__kind']
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_mutex_t.
- """
-
- return 'pthread_mutex_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_mutex_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the mutex's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- self.read_type()
- self.read_status()
- self.read_attributes()
- self.read_misc_info()
-
- def read_type(self):
- """Read the mutex's type."""
-
- mutex_type = self.kind & PTHREAD_MUTEX_KIND_MASK
-
- # mutex_type must be casted to int because it's a gdb.Value
- self.values.append(MUTEX_TYPES[int(mutex_type)])
-
- def read_status(self):
- """Read the mutex's status.
-
- For architectures which support lock elision, this method reads
- whether the mutex appears as locked in memory (i.e. it may show it as
- unlocked even after calling pthread_mutex_lock).
- """
-
- if self.kind == PTHREAD_MUTEX_DESTROYED:
- self.values.append(('Status', 'Destroyed'))
- elif self.kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP:
- self.read_status_robust()
- else:
- self.read_status_no_robust()
-
- def read_status_robust(self):
- """Read the status of a robust mutex.
-
- In glibc robust mutexes are implemented in a very different way than
- non-robust ones. This method reads their locking status,
- whether it may have waiters, their registered owner (if any),
- whether the owner is alive or not, and the status of the state
- they're protecting.
- """
-
- if self.lock == PTHREAD_MUTEX_UNLOCKED:
- self.values.append(('Status', 'Unlocked'))
- else:
- if self.lock & FUTEX_WAITERS:
- self.values.append(('Status', 'Locked, possibly with waiters'))
- else:
- self.values.append(('Status',
- 'Locked, possibly with no waiters'))
-
- if self.lock & FUTEX_OWNER_DIED:
- self.values.append(('Owner ID', '%d (dead)' % self.owner))
- else:
- self.values.append(('Owner ID', self.lock & FUTEX_TID_MASK))
-
- if self.owner == PTHREAD_MUTEX_INCONSISTENT:
- self.values.append(('State protected by this mutex',
- 'Inconsistent'))
- elif self.owner == PTHREAD_MUTEX_NOTRECOVERABLE:
- self.values.append(('State protected by this mutex',
- 'Not recoverable'))
-
- def read_status_no_robust(self):
- """Read the status of a non-robust mutex.
-
- Read info on whether the mutex is locked, if it may have waiters
- and its owner (if any).
- """
-
- lock_value = self.lock
-
- if self.kind & PTHREAD_MUTEX_PRIO_PROTECT_NP:
- lock_value &= ~(PTHREAD_MUTEX_PRIO_CEILING_MASK)
-
- if lock_value == PTHREAD_MUTEX_UNLOCKED:
- self.values.append(('Status', 'Unlocked'))
- else:
- if self.kind & PTHREAD_MUTEX_PRIO_INHERIT_NP:
- waiters = self.lock & FUTEX_WAITERS
- owner = self.lock & FUTEX_TID_MASK
- else:
- # Mutex protocol is PP or none
- waiters = (self.lock != PTHREAD_MUTEX_LOCKED_NO_WAITERS)
- owner = self.owner
-
- if waiters:
- self.values.append(('Status', 'Locked, possibly with waiters'))
- else:
- self.values.append(('Status',
- 'Locked, possibly with no waiters'))
-
- self.values.append(('Owner ID', owner))
-
- def read_attributes(self):
- """Read the mutex's attributes."""
-
- if self.kind != PTHREAD_MUTEX_DESTROYED:
- if self.kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP:
- self.values.append(('Robust', 'Yes'))
- else:
- self.values.append(('Robust', 'No'))
-
- # In glibc, robust mutexes always have their pshared flag set to
- # 'shared' regardless of what the pshared flag of their
- # mutexattr was. Therefore a robust mutex will act as shared
- # even if it was initialized with a 'private' mutexattr.
- if self.kind & PTHREAD_MUTEX_PSHARED_BIT:
- self.values.append(('Shared', 'Yes'))
- else:
- self.values.append(('Shared', 'No'))
-
- if self.kind & PTHREAD_MUTEX_PRIO_INHERIT_NP:
- self.values.append(('Protocol', 'Priority inherit'))
- elif self.kind & PTHREAD_MUTEX_PRIO_PROTECT_NP:
- prio_ceiling = ((self.lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
- >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT)
-
- self.values.append(('Protocol', 'Priority protect'))
- self.values.append(('Priority ceiling', prio_ceiling))
- else:
- # PTHREAD_PRIO_NONE
- self.values.append(('Protocol', 'None'))
-
- def read_misc_info(self):
- """Read miscellaneous info on the mutex.
-
- For now this reads the number of times a recursive mutex was locked
- by the same thread.
- """
-
- mutex_type = self.kind & PTHREAD_MUTEX_KIND_MASK
-
- if mutex_type == PTHREAD_MUTEX_RECURSIVE and self.count > 1:
- self.values.append(('Times locked recursively', self.count))
-
-class MutexAttributesPrinter(object):
- """Pretty printer for pthread_mutexattr_t.
-
- In the NPTL this is a type that's always casted to struct pthread_mutexattr
- which has a single 'mutexkind' field containing the actual attributes.
- """
-
- def __init__(self, mutexattr):
- """Initialize the printer's internal data structures.
-
- Args:
- mutexattr: A gdb.value representing a pthread_mutexattr_t.
- """
-
- mutexattr_struct = gdb.lookup_type('struct pthread_mutexattr')
- self.mutexattr = mutexattr.cast(mutexattr_struct)['mutexkind']
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_mutexattr_t.
- """
-
- return 'pthread_mutexattr_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_mutexattr_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the mutexattr's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- mutexattr_type = (self.mutexattr
- & ~PTHREAD_MUTEXATTR_FLAG_BITS
- & ~PTHREAD_MUTEX_NO_ELISION_NP)
-
- # mutexattr_type must be casted to int because it's a gdb.Value
- self.values.append(MUTEX_TYPES[int(mutexattr_type)])
-
- if self.mutexattr & PTHREAD_MUTEXATTR_FLAG_ROBUST:
- self.values.append(('Robust', 'Yes'))
- else:
- self.values.append(('Robust', 'No'))
-
- if self.mutexattr & PTHREAD_MUTEXATTR_FLAG_PSHARED:
- self.values.append(('Shared', 'Yes'))
- else:
- self.values.append(('Shared', 'No'))
-
- protocol = ((self.mutexattr & PTHREAD_MUTEXATTR_PROTOCOL_MASK) >>
- PTHREAD_MUTEXATTR_PROTOCOL_SHIFT)
-
- if protocol == PTHREAD_PRIO_NONE:
- self.values.append(('Protocol', 'None'))
- elif protocol == PTHREAD_PRIO_INHERIT:
- self.values.append(('Protocol', 'Priority inherit'))
- elif protocol == PTHREAD_PRIO_PROTECT:
- self.values.append(('Protocol', 'Priority protect'))
-
-CLOCK_IDS = {
- CLOCK_REALTIME: 'CLOCK_REALTIME',
- CLOCK_MONOTONIC: 'CLOCK_MONOTONIC',
- CLOCK_PROCESS_CPUTIME_ID: 'CLOCK_PROCESS_CPUTIME_ID',
- CLOCK_THREAD_CPUTIME_ID: 'CLOCK_THREAD_CPUTIME_ID',
- CLOCK_MONOTONIC_RAW: 'CLOCK_MONOTONIC_RAW',
- CLOCK_REALTIME_COARSE: 'CLOCK_REALTIME_COARSE',
- CLOCK_MONOTONIC_COARSE: 'CLOCK_MONOTONIC_COARSE'
-}
-
-class ConditionVariablePrinter(object):
- """Pretty printer for pthread_cond_t."""
-
- def __init__(self, cond):
- """Initialize the printer's internal data structures.
-
- Args:
- cond: A gdb.value representing a pthread_cond_t.
- """
-
- data = cond['__data']
- self.total_seq = data['__total_seq']
- self.mutex = data['__mutex']
- self.nwaiters = data['__nwaiters']
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_cond_t.
- """
-
- return 'pthread_cond_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_cond_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the condvar's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- self.read_status()
- self.read_attributes()
- self.read_mutex_info()
-
- def read_status(self):
- """Read the status of the condvar.
-
- This method reads whether the condvar is destroyed and how many threads
- are waiting for it.
- """
-
- if self.total_seq == PTHREAD_COND_DESTROYED:
- self.values.append(('Status', 'Destroyed'))
-
- self.values.append(('Threads waiting for this condvar',
- self.nwaiters >> COND_NWAITERS_SHIFT))
-
- def read_attributes(self):
- """Read the condvar's attributes."""
-
- clock_id = self.nwaiters & ((1 << COND_NWAITERS_SHIFT) - 1)
-
- # clock_id must be casted to int because it's a gdb.Value
- self.values.append(('Clock ID', CLOCK_IDS[int(clock_id)]))
-
- shared = (self.mutex == PTHREAD_COND_SHARED)
-
- if shared:
- self.values.append(('Shared', 'Yes'))
- else:
- self.values.append(('Shared', 'No'))
-
- def read_mutex_info(self):
- """Read the data of the mutex this condvar is bound to.
-
- A pthread_cond_t's __data.__mutex member is a void * which
- must be casted to pthread_mutex_t *. For shared condvars, this
- member isn't recorded and has a value of ~0l instead.
- """
-
- if self.mutex and self.mutex != PTHREAD_COND_SHARED:
- mutex_type = gdb.lookup_type('pthread_mutex_t')
- mutex = self.mutex.cast(mutex_type.pointer()).dereference()
-
- self.values.append(('Mutex', mutex))
-
-class ConditionVariableAttributesPrinter(object):
- """Pretty printer for pthread_condattr_t.
-
- In the NPTL this is a type that's always casted to struct pthread_condattr,
- which has a single 'value' field containing the actual attributes.
- """
-
- def __init__(self, condattr):
- """Initialize the printer's internal data structures.
-
- Args:
- condattr: A gdb.value representing a pthread_condattr_t.
- """
-
- condattr_struct = gdb.lookup_type('struct pthread_condattr')
- self.condattr = condattr.cast(condattr_struct)['value']
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_condattr_t.
- """
-
- return 'pthread_condattr_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_condattr_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the condattr's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- clock_id = self.condattr & ((1 << COND_NWAITERS_SHIFT) - 1)
-
- # clock_id must be casted to int because it's a gdb.Value
- self.values.append(('Clock ID', CLOCK_IDS[int(clock_id)]))
-
- if self.condattr & 1:
- self.values.append(('Shared', 'Yes'))
- else:
- self.values.append(('Shared', 'No'))
-
-class RWLockPrinter(object):
- """Pretty printer for pthread_rwlock_t."""
-
- def __init__(self, rwlock):
- """Initialize the printer's internal data structures.
-
- Args:
- rwlock: A gdb.value representing a pthread_rwlock_t.
- """
-
- data = rwlock['__data']
- self.readers = data['__nr_readers']
- self.queued_readers = data['__nr_readers_queued']
- self.queued_writers = data['__nr_writers_queued']
- self.writer_id = data['__writer']
- self.shared = data['__shared']
- self.prefers_writers = data['__flags']
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_rwlock_t.
- """
-
- return 'pthread_rwlock_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_rwlock_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the rwlock's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- self.read_status()
- self.read_attributes()
-
- def read_status(self):
- """Read the status of the rwlock."""
-
- # Right now pthread_rwlock_destroy doesn't do anything, so there's no
- # way to check if an rwlock is destroyed.
-
- if self.writer_id:
- self.values.append(('Status', 'Locked (Write)'))
- self.values.append(('Writer ID', self.writer_id))
- elif self.readers:
- self.values.append(('Status', 'Locked (Read)'))
- self.values.append(('Readers', self.readers))
- else:
- self.values.append(('Status', 'Unlocked'))
-
- self.values.append(('Queued readers', self.queued_readers))
- self.values.append(('Queued writers', self.queued_writers))
-
- def read_attributes(self):
- """Read the attributes of the rwlock."""
-
- if self.shared:
- self.values.append(('Shared', 'Yes'))
- else:
- self.values.append(('Shared', 'No'))
-
- if self.prefers_writers:
- self.values.append(('Prefers', 'Writers'))
- else:
- self.values.append(('Prefers', 'Readers'))
-
-class RWLockAttributesPrinter(object):
- """Pretty printer for pthread_rwlockattr_t.
-
- In the NPTL this is a type that's always casted to
- struct pthread_rwlockattr, which has two fields ('lockkind' and 'pshared')
- containing the actual attributes.
- """
-
- def __init__(self, rwlockattr):
- """Initialize the printer's internal data structures.
-
- Args:
- rwlockattr: A gdb.value representing a pthread_rwlockattr_t.
- """
-
- rwlockattr_struct = gdb.lookup_type('struct pthread_rwlockattr')
- self.rwlockattr = rwlockattr.cast(rwlockattr_struct)
- self.values = []
- self.read_values()
-
- def to_string(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_rwlockattr_t.
- """
-
- return 'pthread_rwlockattr_t'
-
- def children(self):
- """gdb API function.
-
- This is called from gdb when we try to print a pthread_rwlockattr_t.
- """
-
- return self.values
-
- def read_values(self):
- """Read the rwlockattr's info and store it in self.values.
-
- The data contained in self.values will be returned by the Iterator
- created in self.children.
- """
-
- rwlock_type = self.rwlockattr['lockkind']
- shared = self.rwlockattr['pshared']
-
- if shared == PTHREAD_PROCESS_SHARED:
- self.values.append(('Shared', 'Yes'))
- else:
- # PTHREAD_PROCESS_PRIVATE
- self.values.append(('Shared', 'No'))
-
- if (rwlock_type == PTHREAD_RWLOCK_PREFER_READER_NP or
- rwlock_type == PTHREAD_RWLOCK_PREFER_WRITER_NP):
- # This is a known bug. Using PTHREAD_RWLOCK_PREFER_WRITER_NP will
- # still make the rwlock prefer readers.
- self.values.append(('Prefers', 'Readers'))
- elif rwlock_type == PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP:
- self.values.append(('Prefers', 'Writers'))
-
-def register(objfile):
- """Register the pretty printers within the given objfile."""
-
- printer = gdb.printing.RegexpCollectionPrettyPrinter('glibc pthread locks')
-
- printer.add_printer('pthread_mutex_t', r'^pthread_mutex_t$',
- MutexPrinter)
- printer.add_printer('pthread_mutexattr_t', r'^pthread_mutexattr_t$',
- MutexAttributesPrinter)
- printer.add_printer('pthread_cond_t', r'^pthread_cond_t$',
- ConditionVariablePrinter)
- printer.add_printer('pthread_condattr_t', r'^pthread_condattr_t$',
- ConditionVariableAttributesPrinter)
- printer.add_printer('pthread_rwlock_t', r'^pthread_rwlock_t$',
- RWLockPrinter)
- printer.add_printer('pthread_rwlockattr_t', r'^pthread_rwlockattr_t$',
- RWLockAttributesPrinter)
-
- gdb.printing.register_pretty_printer(objfile, printer)
-
-register(gdb.current_objfile())
diff --git a/nptl/nptl_lock_constants.pysym b/nptl/nptl_lock_constants.pysym
deleted file mode 100644
index e6ac427..0000000
--- a/nptl/nptl_lock_constants.pysym
+++ /dev/null
@@ -1,75 +0,0 @@
-#include <pthreadP.h>
-
--- Mutex types
-PTHREAD_MUTEX_KIND_MASK PTHREAD_MUTEX_KIND_MASK_NP
-PTHREAD_MUTEX_NORMAL
-PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
-PTHREAD_MUTEX_ERRORCHECK PTHREAD_MUTEX_ERRORCHECK_NP
-PTHREAD_MUTEX_ADAPTIVE_NP
-
--- Mutex status
--- These are hardcoded all over the code; there are no enums/macros for them.
-PTHREAD_MUTEX_DESTROYED -1
-PTHREAD_MUTEX_UNLOCKED 0
-PTHREAD_MUTEX_LOCKED_NO_WAITERS 1
-
--- For robust mutexes
-PTHREAD_MUTEX_INCONSISTENT
-PTHREAD_MUTEX_NOTRECOVERABLE
-FUTEX_OWNER_DIED
-
--- For robust and PI mutexes
-FUTEX_WAITERS
-FUTEX_TID_MASK
-
--- Mutex attributes
-PTHREAD_MUTEX_ROBUST_NORMAL_NP
-PTHREAD_MUTEX_PRIO_INHERIT_NP
-PTHREAD_MUTEX_PRIO_PROTECT_NP
-PTHREAD_MUTEX_PSHARED_BIT
-PTHREAD_MUTEX_PRIO_CEILING_SHIFT
-PTHREAD_MUTEX_PRIO_CEILING_MASK
-
--- Mutex attribute flags
-PTHREAD_MUTEXATTR_PROTOCOL_SHIFT
-PTHREAD_MUTEXATTR_PROTOCOL_MASK
-PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
-PTHREAD_MUTEXATTR_FLAG_ROBUST
-PTHREAD_MUTEXATTR_FLAG_PSHARED
-PTHREAD_MUTEXATTR_FLAG_BITS
-PTHREAD_MUTEX_NO_ELISION_NP
-
--- Priority protocols
-PTHREAD_PRIO_NONE
-PTHREAD_PRIO_INHERIT
-PTHREAD_PRIO_PROTECT
-
--- These values are hardcoded as well:
--- Value of __mutex for shared condvars.
-PTHREAD_COND_SHARED ~0l
-
--- Value of __total_seq for destroyed condvars.
-PTHREAD_COND_DESTROYED -1ull
-
--- __nwaiters encodes the number of threads waiting on a condvar
--- and the clock ID.
--- __nwaiters >> COND_NWAITERS_SHIFT gives us the number of waiters.
-COND_NWAITERS_SHIFT
-
--- Condvar clock IDs
-CLOCK_REALTIME
-CLOCK_MONOTONIC
-CLOCK_PROCESS_CPUTIME_ID
-CLOCK_THREAD_CPUTIME_ID
-CLOCK_MONOTONIC_RAW
-CLOCK_REALTIME_COARSE
-CLOCK_MONOTONIC_COARSE
-
--- Rwlock attributes
-PTHREAD_RWLOCK_PREFER_READER_NP
-PTHREAD_RWLOCK_PREFER_WRITER_NP
-PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
-
--- 'Shared' attribute values
-PTHREAD_PROCESS_PRIVATE
-PTHREAD_PROCESS_SHARED